Sand spit morphological evolution at tidal inlets by using satellite images analysis: Two case studies in Vietnam

Anh, Nguyen Quang Duc; Tanaka, Hitoshi; Tinh, Nguyen Xuan; Viet, Nguyen Trung

doi:10.31814/stce.nuce2020-14(2)-02

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…To make a comparison, the morphodynamic properties of other studied inlets and river mouths in the world are plotted, additionally included in the figure. Those inlets and river mouths are the Volta River mouth in Ghana and the Bouche du Roi inlet in Benin [26], the Badreveln spit in Sweden and Fire Island Inlet in the USA [20], Sangomar spit in Senegal [49], and six inlets and river mouths along the Vietnamese coastline [2,13,50,51]. All values used in Figure 12 are summarized in Table 4.…”

Section: Comparison With Other Study Areas In the Worldmentioning

confidence: 99%

Sand Spit Morphology at an Inlet on Phu Quoc Island, Vietnam

Duy

Tỷ

Thanh

et al. 2023

Water

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Tidal inlets with attached sand spits are a very common coastal landform. Since the evolution of sand spits along coastlines influence the social-economic development of local coastal areas, sand spits have become the objects of numerous studies. However, previous studies have mainly focused on sand spits that are usually in the scale of hundreds of meters in width, whilst knowledge about the evolution of smaller-scale sand spits still remains limited. Therefore, in this study, the morphological change of a small and unexplored sand spit in front of Song Tranh Inlet on the west coast of Phu Quoc Island, Vietnam is investigated. Satellite images are first used to observe the morphological change of the sand spit and calculate the longshore sediment transport rates (LSTR) along the sand spit. Waves and beach sediments are collected at the study site to calculate the longshore sediment transport rate using the CERC formula. It is found that there is a seasonal variation in the evolution of the sand spit at Song Tranh Inlet. The longshore sediment transport rates along the spit calculated by image analysis are 39,000 m3/year, 66,000 m3/year, and 40,000 m3/year, whilst the longshore sediment transport rate calculated by the CERC formula is 72,000 m3/year. This study aims to contribute to the methodology for investigating the evolutions of small sand spits and, specifically, sustainable coastal management for Phu Quoc Island, which is well-known as the Pearl Island of Vietnam.

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Section: Comparison With Other Study Areas In the Worldmentioning

confidence: 99%

Sand Spit Morphology at an Inlet on Phu Quoc Island, Vietnam

Duy

Tỷ

Thanh

et al. 2023

Water

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“…In order to make comparison, morphodynamic properties of other inlets and river mouths in the world are plotted in the figure. Those inlets and river mouths are Volta River mouth in Ghana and Bouche du Roi inlet in Benin [25], Badreveln spit in Sweden and Fire Island Inlet in USA [19], Sangomar spit in Senegal [43] and six inlets and river mouths along the Vietnamse coastline [2,12,44,45] . All values used in Error!…”

Section: Long Shore Sediment Transport Ratementioning

confidence: 99%

Spit Morphology at an Inlet in Phu Quoc Island, Vietnam

Duy¹,

Tỷ²,

Thanh³

et al. 2023

Preprint

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Tidal inlets with attached sand spits are a very common coastal morphology. Since the evolution of the sand spits along the coastline have greatly affected on the social-economic development of local coastal areas. However, previous studies mainly focused on the sand spits which are usually in the scales of hundred meters in width. Therefore, in this study, morphological change of a smaller and unexplored sand spit located in the west coast of Phu Quoc Island, will be investigated. It was found that there is a seasonal variation in the evolution of the sand spit at Song Tranh Inlet. The Longshore sediment transport rates (LSTR) along the spit are in the order from 104 to 105 m3/year. LSTRs of fourteen inlets in the literature were reviewed and the LSTRs at Song Tranh Inlet are higher than half of the LSTRs along the fourteen reviewed inlets. This study aims at contrib-uting to the growing literature on sand spit morphological changes as well as the sustainable coastal management for Phu Quoc Island which is well known as the Pearl Island of Vietnam.

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“…Several studies of large barrier systems, including barrier island or beach ridges and sand spits, have been well-studied, primarily when associated with extreme storm events [30][31][32][33][34][35]. They have shown to constitute a valuable archive of coastal evolution and their morphology, and internal structures contain information on both past relative sea levels and past storminess activity.…”

Section: Barrier Islands and Spits Morphological Resiliencementioning

confidence: 99%

“…They have shown to constitute a valuable archive of coastal evolution and their morphology, and internal structures contain information on both past relative sea levels and past storminess activity. Barrier islands and sand spits are considered exemplars of coastal resilience [30,31] and critically essential ecosystems to protect the low-lying area behind them [36]. Under the influence of storms, large barrier systems, such as barrier island and beach ridges, are inherently resilient landforms as long as they can internally recycle sediment to maintain overall landform integrity [37], the rate of sea-level rise is not excessive, and there is no sediment deficit [38].…”

Section: Barrier Islands and Spits Morphological Resiliencementioning

confidence: 99%

“…Nott et al [33] suggest that the building of beach ridges is being slowed down by a decrease in sediment supply to the coast due to less frequent river floods during periods of reduced storminess. While during a storm event barrier islands may experience breaching due to the intensive funneling of the overwash flows into specific throats [39], a calmer wave regime promotes littoral drift, allowing sand spits to grow extensively [30].…”

Section: Barrier Islands and Spits Morphological Resiliencementioning

confidence: 99%

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Barrier Islands Resilience to Extreme Events: Do Earthquake and Tsunami Play a Role?

Meilianda

Lavigne

Pradhan

et al. 2021

Water

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Barrier islands are indicators of coastal resilience. Previous studies have proven that barrier islands are surprisingly resilient to extreme storm events. At present, little is known about barrier systems’ resilience to seismic events triggering tsunamis, co-seismic subsidence, and liquefaction. The objective of this study is, therefore, to investigate the morphological resilience of the barrier islands in responding to those secondary effects of seismic activity of the Sumatra–Andaman subduction zone and the Great Sumatran Fault system. Spatial analysis in Geographical Information Systems (GIS) was utilized to detect shoreline changes from the multi-source datasets of centennial time scale, including old topographic maps and satellite images from 1898 until 2017. Additionally, the earthquake and tsunami records and established conceptual models of storm effects to barrier systems, are corroborated to support possible forcing factors analysis. Two selected coastal sections possess different geomorphic settings are investigated: (1) Lambadeuk, the coast overlying the Sumatran Fault system, (2) Kuala Gigieng, located in between two segments of the Sumatran Fault System. Seven consecutive pairs of comparable old topographic maps and satellite images reveal remarkable morphological changes in the form of breaching, landward migrating, sinking, and complete disappearing in different periods of observation. While semi-protected embayed Lambadeuk is not resilient to repeated co-seismic land subsidence, the wave-dominated Kuala Gigieng coast is not resilient to the combination of tsunami and liquefaction events. The mega-tsunami triggered by the 2004 earthquake led to irreversible changes in the barrier islands on both coasts.

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Sand spit morphological evolution at tidal inlets by using satellite images analysis: Two case studies in Vietnam

Cited by 6 publications

References 14 publications

Sand Spit Morphology at an Inlet on Phu Quoc Island, Vietnam

Sand Spit Morphology at an Inlet on Phu Quoc Island, Vietnam

Spit Morphology at an Inlet in Phu Quoc Island, Vietnam

Barrier Islands Resilience to Extreme Events: Do Earthquake and Tsunami Play a Role?

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